Teen Pleads Guilty to Murdering Isabella Tennant

July 3, 2013 Updated Jul 3, 2013 at 12:42 PM EDT

By Rachel Elzufon

July 3, 2013 Updated Jul 3, 2013 at 12:42 PM EDT

Lockport, NY (WKBW) - The teen accused of killing a five-year-old little girl in Niagara Falls late in the summer of 2012 has pled guilty.

17-year-old John Freeman entered a guilty plea to second degree murder and tampering with evidence, in the death of Isabella Tennant.

The judge says by pleading guilty, he faces a sentence of 20-22 years to life in prison.

According to the Niagara Gazette, Freeman had originally been scheduled for a ruling to let him use an "insanity defense."

Freeman killed Tennant while she was staying with her great-grandmother in Niagara Falls in late August. Her body was found in a garbage can a few blocks away.

Freeman will be sentenced on September 5th.

19-year-old Tyler Best is accused of tampering with evidence. He is accused of helping Freeman move Tennant's body.